http://www.hammacher.com/Product/78339
Kristin, you might be interested in this :-)
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The Posture Sensing Shirt.
This is the shirt that alerts you of improper posture to help prevent
neck, back, and shoulder pain. Whenever you slouch, an electronic sensor
detects the increased tension in the shirt's built-in microfilaments and
vibrates to let you know your posture is not optimal (vibration ceases
when you correct yourself). Designed by the team physician for the
Boston Celtics, the tension can be adjusted to suit your posture. The
washable, unisex shirt can be worn as an undershirt and is made from a
95% cotton/5% spandex blend. Uses (and includes) three watch batteries.
Fit should be snug to ensure optimal sensitivity of microfilaments;
order one size smaller than you normally wear for a t-shirt.
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$129!! But it's out of stock anyway.
Eric